Yin Longwei, Li Wenpeng, Lin Shen, Owens Gary, Chen Zuliang
School of Chemistry& Materials Science, Fujian Normal University, Fuzhou, 350007, China.
School of Environmental Science and Engineering, Fujian Normal University, Fuzhou, 350007, China.
Chemosphere. 2022 Oct;304:135269. doi: 10.1016/j.chemosphere.2022.135269. Epub 2022 Jun 9.
Arsenic contamination is an increasing global environmental problem, especially in mining industry wastewater where both arsenite (As(III)) and arsenate (As(V)) have been routinely detected. In this paper, a novel porous metal-organic framework material (ZIF-8) was composited with iron nanoparticles (FeNPs) to form a functional material (ZIF-8@FeNPs) for the simultaneous removal of As(III)/(V) from wastewater. The material effectively removed both As(III) and As(V) with removal efficiencies of 99.9 and 71.2%, respectively. Advanced characterization techniques including X-ray photoelectron spectroscopy (XPS) and Fourier infrared (FTIR) indicated that removal of As(III) and As(V) involved complex formation. Adsorption kinetics followed a pseudo-second order kinetics indicating adsorption involved chemisorption. After four cycles of reuse the he removal rate of As species was still relatively high at > 60% When ZIF-8@FeNPs were used to remove As from real wastewater from acid mines the removal efficiency was 94.27%. Finally, a As(III) and As(V) removal mechanism was proposed.
砷污染是一个日益严重的全球环境问题，特别是在采矿业废水中，亚砷酸盐（As(III)）和砷酸盐（As(V)）经常被检测到。在本文中，一种新型多孔金属有机框架材料（ZIF-8）与铁纳米颗粒（FeNPs）复合，形成一种功能材料（ZIF-8@FeNPs），用于同时从废水中去除As(III)/(V)。该材料有效地去除了As(III)和As(V)，去除效率分别为99.9%和71.2%。包括X射线光电子能谱（XPS）和傅里叶红外光谱（FTIR）在内的先进表征技术表明，As(III)和As(V)的去除涉及络合物的形成。吸附动力学遵循准二级动力学，表明吸附涉及化学吸附。经过四个循环的重复使用，As物种的去除率仍相对较高，>60%。当使用ZIF-8@FeNPs从酸性矿山的实际废水中去除As时，去除效率为94.27%。最后，提出了As(III)和As(V)的去除机制。
